elementtree.ElementTree

from google.appengine.api import urlfetch
from elementtree.ElementTree import *

url="http://api.flickr.com/services/rest/"
url += "?method=flickr.photos.search&text=test"
url += "&api_key=XXX"
url += "&per_page=3"
result = urlfetch.fetch(url)
#print result.content

tree = ElementTree(fromstring(result.content))

for item in tree.findall('.//photos'):
 print item[0].get('id')
 print item[0].get('title')
for d in item:
 print d.get('title')

http://python.matrix.jp/modules/ElementTree.html

There's no need to install anything, ElementTree is included in
Python 2.5

http://docs.python.org/lib/module-xml.etree.ElementTree.html

flickr.photos.search (Google App Engine)

from google.appengine.api import urlfetch
from xml.dom import minidom

url="http://api.flickr.com/services/rest/?method=flickr.photos.search&text=test&api_key=XXX"
result = urlfetch.fetch(url)

dom = minidom.parseString(result.content)

photos = []
for node in dom.getElementsByTagName('photo'):
photos.append({
  'server': node.getAttribute('server'),
  'id': node.getAttribute('id'),
  'secret': node.getAttribute('secret'),
  'owner': node.getAttribute('owner'),
  'title': node.getAttribute('title')
})

# print node.getAttribute('id'), \
#       node.getAttribute('title')

----------------------------
[ templates]
{% for e in photos %}
<a href="http://www.flickr.com/photos/{{ e.owner }}/{{ e.id }}/sizes/" >
<img src="http://static.flickr.com/{{ e.server }}/{{ e.id }}_{{ e.secret }}_s.jpg"
title="{{ e.title }}" border=0 /></a>
{% endfor %}

getElementsByTagName

<?xml version="1.0" encoding="utf-8" ?> <rsp stat="ok"> <method>flickr.test.echo</method> <name>value</name> <api_key>7c7ac3c40f14a809XXXX</api_key> </rsp>

から valueを取り出す。

from google.appengine.api import urlfetch
from xml.dom import minidom 
url="http://api.flickr.com/services/rest/?method=flickr.test.echo&name=value&api_key=XXX"
result = urlfetch.fetch(url)
print "---result"
print result
print "---result.content"
print result.content
dom = minidom.parseString(result.content)
r =dom.getElementsByTagName('name')[0].firstChild.data
print "---dom.getElementsByTagName"
print r

<?xml version="1.0" encoding="utf-8" ?> <rsp stat="fail"> <err code="100" msg="Invalid API Key (Key not found)" /> &l

からfail を取り出すにはdom.getElementsByTagName('rsp')[0].getAttribute('stat')

http://www.geocities.jp/xmlfirststep/pydom/pydom5.html

Google App Engine Interactive Console

urlfetch した結果の result ( object ) 　を
print result.content
とすると、　返信された xml の内容が確認できます。

from google.appengine.api import urlfetch
from xml.dom import minidom 
url="http://api.flickr.com/services/rest/?method=flickr.test.echo&name=value&api_key=XXX"
result = urlfetch.fetch(url)
print "---result"
print result
print "---result.content"
print result.content
dom = minidom.parseString(result.content)
r =dom.getElementsByTagName('name')[0].firstChild.data
print "---dom.getElementsByTagName"
print r

Request

---

Request Format には３つの書式があり、 REST の場合、URL に記述することだけで
リクエストを送信することができます。

http://api.flickr.com/services/rest/?method=flickr.test.echo&name=value

実際には以下のように必ず取得した api_key を追加しないとエラーとなります。

http://api.flickr.com/services/rest/?method=flickr.test.echo&name=value&api_key=XXXX

http://www.flickr.com/services/api/

A working XML parsing example!

http://groups.google.com/group/google-appengine/browse_thread/thread/85b7d03ff0d4ff2b/9fdfec112a4c051a


SimpleXMLTreeBuilder is no longer supported in the latest SDK. Returns
"object is unsubscriptable" error.


Update: I hope this is still useful for people searching for a working
example!

I can confirm that minidom now works in SDK 1.0.2. As I understand
it, this is because pyexpat is now in the GAE whitelist of C
libraries:

http://code.google.com/appengine/kb/libraries.html

I am using SDK 1.0.2 on Windows XP, therefore for this to work I
needed to patch urlfetch_stub.py because the development server was
discarding my URL parameters.

http://code.google.com/p/googleappengine/issues/detail?id=341

You no longer need to use upload a version of the SimpleXMLTreeBuilder
(although this still works) and the code using minidom now looks like
this:

-----

from google.appengine.api import urlfetch
from xml.dom import minidom

WEATHER_URL = 'http://xml.weather.yahoo.com/forecastrss?p=%s'
WEATHER_NS = 'http://xml.weather.yahoo.com/ns/rss/1.0'

def parse( url ) :
result = urlfetch.fetch(url)
if result.status_code == 200:
       return minidom.parseString(result.content)

def weather_for_zip(zip_code):
url = WEATHER_URL % zip_code
dom = parse(url)
forecasts = []
for node in dom.getElementsByTagNameNS(WEATHER_NS, 'forecast'):
    forecasts.append({
        'date': node.getAttribute('date'),
        'low': node.getAttribute('low'),
        'high': node.getAttribute('high'),
        'condition': node.getAttribute('text')
    })
return {
    'forecasts': forecasts,
    'title': dom.getElementsByTagName('title')[0].firstChild.data
}

print 'Content-Type: text/plain'
print ''
print weather_for_zip('94089')


{'title': u'Yahoo! Weather - Sunnyvale, CA', 'forecasts': [{'date': u'22 May 2008', 'high': u'75', 'low': u'53', 'condition': u'Sunny'}, {'date': u'23 May 2008', 'high': u'73', 'low': u'53', 'condition': u'Partly Cloudy'}]}

---

http://www.kharakawa.com/kh.log/archives/python/

Broken Datastore

IMProperty での例があったけれども、不正なデータが datatore に登録されて、
削除できなくなる ( fetch も) できなくなってしまう不具合がある。

http://groups.google.com/group/google-appengine/browse_thread/thread/3c3d2da5f7140b18/e80ac633370859db?hl=en&lnk=gst&q=can%27t+delete#e80ac633370859db


%Y ( 2008 ) を省略した日時データを datetime に登録してしまって、削除もできなくなってしまった。
結局 -cleare_datastore してしまったが...

value = datastore_types.FromPropertyPb(prop)
File "C:\Program Files\Google\google_appengine\google\appengine\api\datastore_types.py", line 1102, in FromPropertyPb
'Error converting pb: %s\nException was: %s' % (pb, msg))
BadValueError: Error converting pb: meaning: 7
name: "entry_date"
value <
int64Value: 0xfff831bf8bc87700
>
multiple: false

Exception was: timestamp out of range for platform time_t

http://code.google.com/appengine/docs/thedevwebserver.html

dev_appserver.py --datastore_path=/tmp/myapp_datastore myapp

Default (Windows XP)
C:\Documents and Settings\XXX\Local Settings\Temp\dev_appserver.datastore
C:\Documents and Settings\XXX\Local Settings\Temp\dev_appserver.datastore.history